... DVS Digital Video Server 3.H.264 video compression 4.2TB SATA HDD local storage IP ... Server 1. Uses SOC (system on chip) design, with built-in advanced RISC microprocessor 9 (ARM9) & DSP2 ... . H.264 video compression3. With Email-alert function, auto-send an email when alarm ... RTSP, SMTP, FTP, DHCP, DNS, DDNS protocols9. With RS485/RS232 control ports10. SDK available11. Supports USB backup ...